Final answer:
E. light. Out of the given options, light is not considered a chemical. It is a form of energy composed of photons, unlike carbon dioxide, salt, sugar, and water which have specific chemical compositions.
Step-by-step explanation:
The question is asking which item listed is not considered a chemical. A chemical is defined as any basic substance that is used in or produced by a chemical process. Items A (carbon dioxide), B (salt), C (sugar), and D (water) are all examples of chemicals because they all have specific chemical compositions and structures.
However, E (light) is not a chemical; it is a form of energy. Light is composed of photons, which are elementary particles, not chemicals.